AD8260ACPZ-R7 datasheet(25/32 Pages) AD

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AD8260

Rev. 0 | Page 25 of 32

APPLICATIONS INFORMATION

The AD8260 is ideally suited for compact applications requiring

high frequency and large current drive of complex modulation

products. Because the driver is capable of providing up to 300 mA

(using a 3.3 V supply rail) to very low impedance loads, undefined

network impedances are of little consequence. Such applications

can include, but are not limited to, local power line wiring

found in homes or in automobiles, or low impedance complex

filters used in communications. Pulse response performance

with loading effects are illustrated by various curves in the

Typical Performance Characteristics section.

Figure 65 is an application block diagram showing AD8260

devices configured as transceivers in a small local network.

In this figure, consider a small security system consisting of a

master controller and four satellite cameras. For example, the

master can be a processor-controlled switch that routes data to

and from local satellite cameras. The cameras video signals are

modulated for transmission over an existing power system such

as the wiring found in homes or small businesses. Using the

existing power network in this way eliminates the need to install

additional cabling, thereby saving cost. Portability is also

achieved because the system can be moved to other locations

should the need arise, simply by unplugging a satellite and

moving it elsewhere. The AD8260 transceivers perform the

same function at the master and slave locations; a high frequency

current-output DAC converts digital-to-analog data for the

high current driver for transmission over a low impedance load.

The input of the VGA/preamplifier connects to the same load,

functioning as the receiver. In such a system, multiple AD8260

devices are connected to form a network, much like a LAN,

except using the power-line wiring in a home or automobile in

lieu of a CAT-5 cable, for example.

LOCAL POWER WIRING

COUPLING

DAC

ADC

MICROPROCESSOR +

MODULATOR

MICROPROCESSOR +

MODULATOR

MICROPROCESSOR +

MODULATOR

CONTROLLER

SATELLITE

CAMERAS

COUPLING

DAC

ADC

CAMERA

AD8260

COUPLING

DAC

ADC

CAMERA

Figure 65. AD8260 Transceiver Application

Figure 66 shows the AD8260 as a low distortion, high power

driver. The VGA and high current driver are combined by

simply connecting the differential output of the VGA directly to

the input of the driver.

AD8260

DAC

COMPLEX LOW

Z FILTER ≥10Ω

VGA/

PREAMPLIFIER

HIGH CURRENT

DRIVER

Figure 66. AD8260 Used as a VGA Driving a Low Impedance Load

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